#include <stdint.h>
#include <string.h>
#include "mg_driver_mtp.h"



#define APPLICATION_ADDRESS     (uint32_t)0x00000610


#define GET_VECTOR      0x4800  //LDR R0, [PC+n]
#define JUMP            0x4687  //MOV PC, R0

#define VECTOR_OFFSET   132
//2 instruction:query app vector table get app interrupt handle address,jump to app interrupt handle
const unsigned short RemapTab[14][2] __attribute__ ((at(APPLICATION_ADDRESS-VECTOR_OFFSET*4))) ={
    {GET_VECTOR+VECTOR_OFFSET+1,        JUMP},          //NMI Handler       offset:0x0f=((APPLICATION_ADDRESS+8) - (APPLICATION_ADDRESS-14*4))/4-1
    {GET_VECTOR+VECTOR_OFFSET+1,        JUMP},          //Hard Fault Handler
    {GET_VECTOR+VECTOR_OFFSET+8,        JUMP},          //SVCall Handler
    {GET_VECTOR+VECTOR_OFFSET+10,       JUMP},          //PendSV Handler
    {GET_VECTOR+VECTOR_OFFSET+10,       JUMP},          //SysTick Handler
    {GET_VECTOR+VECTOR_OFFSET+10,       JUMP},          //Baseband Seg irq handler / led pwm feed data irq
    {GET_VECTOR+VECTOR_OFFSET+10,       JUMP},          //UART irq handler
    {GET_VECTOR+VECTOR_OFFSET+10,       JUMP},          //BB-wakeup&sleep irq handler
    {GET_VECTOR+VECTOR_OFFSET+10,       JUMP},          //RTC irq handler
    {GET_VECTOR+VECTOR_OFFSET+10,       JUMP},          //watch dog irq handler
    {GET_VECTOR+VECTOR_OFFSET+10,       JUMP},          //low voltage power irq handler
    {GET_VECTOR+VECTOR_OFFSET+10,       JUMP},          //GPIO irq handler
    {GET_VECTOR+VECTOR_OFFSET+13,       JUMP},          //timer irq handler
    {GET_VECTOR+VECTOR_OFFSET+14,       JUMP},          //I2C irq handler
};

static void Jump2App(void)
{
    register unsigned long AppStackPointer    __asm("msp");
    
    AppStackPointer = *(unsigned long *)APPLICATION_ADDRESS;     //set sp
    ((void (*)(void))(*(unsigned long *)(APPLICATION_ADDRESS+4)))(); //set pc
}

/*
//table

//CRC algorithm
static const unsigned short CrcCCITTTable[256] =
{
    0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7,
    0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF,
    0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6,
    0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE,
    0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485,
    0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D,
    0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4,
    0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC,
    0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823,
    0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B,
    0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12,
    0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A,
    0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41,
    0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49,
    0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70,
    0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78,
    0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F,
    0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067,
    0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E,
    0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256,
    0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D,
    0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
    0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C,
    0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634,
    0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB,
    0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3,
    0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A,
    0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92,
    0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9,
    0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1,
    0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8,
    0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0
};

//init CRC with 0x0000
unsigned short CRC16(unsigned char* Buf,int BufLen,unsigned short sCRC)
{
    register int i;

    for (i = 0 ; i < BufLen ; i++) {
        sCRC = (sCRC << 8) ^ CrcCCITTTable[((sCRC >> 8) ^ *Buf ++) & 0x00FF];
    }
    return sCRC;
}
*/

//calculation
static unsigned short CRC16(unsigned char* Buf,int BufLen,unsigned short sCRC)
{
    register int i,j;
    for (i = 0 ; i < BufLen ; i++) {
        for(j=0x80; j!=0; j>>=1) {
            if((sCRC & 0x8000) != 0) {
                sCRC = sCRC << 1;
                sCRC = sCRC ^ 0x1021;
            }
            else {
                sCRC = sCRC << 1;
            }
            if((*Buf & j) != 0) {
                sCRC = sCRC ^ 0x1021;  //crc16 = crc16 ^ (0x10000 ^ 0x11021)
            }
        }
        Buf++;
    }

    return sCRC;
}

#define BANK_ID_A (0)
#define BANK_ID_B (1)
/*
0000~05FF(0 ~ 1.5KB) 1.5K    BootCode
0600~3FFF(1.5~16 KB) 14.5K   RunCode (BANK_A)
4000~79FF(16~30.5KB) 14.5K   OTA   (BAnK_B)
7A00~7DFF(30.5~31.5KB) 1K    UserData
*/
#define PAGE_SIZE           256
#define BANK_BASE           0x00000000
#define BANK_A_OFFSET       0x600
#define BANK_A_SIZE_MAX     0x3a00
#define BANK_B_OFFSET       (BANK_A_OFFSET + BANK_A_SIZE_MAX) 
#define BANK_B_SIZE_MAX     0x3a00

static void ClearBank(int BANK_ID_Flag);
static int CheckCodeBank(int BANK_ID_Flag)
{
    int i;
    uint16_t Size,Crc = 0;
    uint8_t* BankAddr = (uint8_t*)(BANK_BASE + BANK_A_OFFSET); //BANKA
    
    if(BANK_ID_Flag == BANK_ID_B)
    {
        BankAddr = (uint8_t*)(BANK_BASE + BANK_B_OFFSET);
    }
    
    //size2B,crc2B LE
    Size = BankAddr[1]; Size <<= 8;  Size |= BankAddr[0];
    if (0 == Size)
    {
        for (i=0;i < BANK_B_SIZE_MAX ;i++)
        {
            if (BankAddr[i])
            {
                break;
            }
        }
        
        if (BANK_B_SIZE_MAX > i)
        {
            ClearBank(BANK_ID_B);
        }
        return 0; //failed
    }
    
    if(Size > BANK_B_SIZE_MAX  - 16)//for safe, error found
    {
        Size = BANK_B_SIZE_MAX - 16;
    }
    
    Crc = CRC16(BankAddr+16,(int)Size,Crc);
    
    if(((Crc & 0xFF) != BankAddr[2]) || (((Crc>>8) & 0xFF) != BankAddr[3]))
    {
        ClearBank(BANK_ID_B);
        return 0; //failed
    }
    
    return 1; //OK
}

static void ClearBank(int BANK_ID_Flag)
{
    int i,clearflag = 0;
    unsigned char* addr = (unsigned char*)(BANK_BASE + BANK_B_OFFSET);
    uint32_t BankAddr = (BANK_BASE + BANK_B_OFFSET);
    
    if(BANK_ID_Flag == BANK_ID_A)
    {
        addr = (unsigned char*)(BANK_BASE + BANK_A_OFFSET);
        BankAddr = (BANK_BASE + BANK_A_OFFSET);
    }
    
    for(i = 0 ; i < BANK_B_SIZE_MAX ; i ++)
    {
        if(0x00 != *addr++)
        {
            clearflag = 1;
            break; //not empty
        }
    }
    
    if(clearflag)
    {
        for(i = 0 ; i < BANK_B_SIZE_MAX; i += PAGE_SIZE)
        {
            EraseSector(BankAddr + i);
        }
    }
}

static unsigned char tab[16];
static void CopyB2A(void)
{ 
    uint16_t Size,i;
    uint32_t BankAddrA = BANK_BASE + BANK_A_OFFSET;
    unsigned char* addr = (unsigned char*)(BANK_BASE + BANK_B_OFFSET);
    uint32_t *AddrA = (uint32_t *)BankAddrA;
    uint32_t *AddrB = (uint32_t *)addr;
    
    Size = addr[1]; Size <<= 8;  Size |= addr[0];
    Size += 16;//header 16 bytes
    
    if(Size > BANK_B_SIZE_MAX)//error
    {
        Size = BANK_B_SIZE_MAX; 
    }
    
    //clear
    ClearBank(BANK_ID_A);
    
    
    for (i=0;i<Size;i+=16)
    {
        memcpy(tab,addr+i,16);
        //copy
        ProgramPage(BankAddrA+i,16,tab);
    }

    
    //check OTA result
    for(i = 0 ; i < Size/4 ; i ++)//no crc16 algorithm is needed,,,,
    {
        if(AddrA[i] != AddrB[i])//error found
        {
            while(1);//!!!! never return, one must re-powerup..... !!!
        }
    }
}


int main(void)
{
    //check bankB
    if(CheckCodeBank(BANK_ID_B))
    {
        CopyB2A();
        ClearBank(BANK_ID_B);
    }
    
    Jump2App();
    
    /* Infinite loop */
    while (1)
    {
    }
}
